A lion would have to be one of the most dangerous animals to hunt. Not only are they extremely intelligent, but most lions are separated into prides. Not to mention, a lion can cover 100 yards in 3 to 4 seconds which is crazy fast and extremely overpowered with their overbearing strength. This is why I believe lions are one of the most dangerous animals in the world to hunt.
I would say tense and uncomfortable because "it was undoubtedly hot" "he began to sweat" "began to throb in his ears" the sweat and heat makes it very uncomfortable also, the rumbling and throbbing sound makes it tense.
hope this helps :D